>>3926216I could be wrong myself, but I'm pretty sure he did it because he was a douche
He was frustrated, needed to blow his steam off after the news was broken, and now that he decided that trying to be better a little a day wasn't worth it, went to the only woman on the ship
He possibly wanted to do it for years, as sad as it could be, or just decided that she wouldn't be able to prove anything once they were back on Earth and he'd never see her again
Given how Curly talks to him in the cockpit, it's entirely possible that Jimmy was some sort of recovering ex-convict before Tulpar, and if people are right when they say that he seemed to have some experience with roofying someone's drink, then he could very well have been a sex-pest
We'll probably never know. I'm just not sure where people get the idea that it too was about Curly